Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-12-18
Phys.Rev.C76:035201,2007
Physics
Nuclear Physics
Nuclear Theory
9 pages, 4 figures, to be submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.76.035201
The extraction of the strangeness form factors from parity violating elastic electron-proton scattering is sensitive to the electromagnetic form factors at low Q^2. We provide parameterizations for the form factors and uncertainties, including the effects of two-photon exchange corrections to the extracted EM form factors. We study effect of the correlations between different form factors, in particular as they impact the parity violating asymmetry and the extraction of the strangeness form factors. We provide a prescription to extract the strangeness form factors from the asymmetry that provides an excellent approximation of the full two-photon correction. The corrected form factors are also appropriate as input for other low-Q analyses, although the effects of correlations and two-photon exchange corrections may be different.
Arrington John
Sick Ingo
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